Saw-filing machine.



PATENTED JULY 16, 1907.

T. G. HOLSCLAW. SAW FILING MACHINE. APPLIOATION rum) 00112, 1906.

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PATENTED JULY 16, 1907.

T. G. HOLSGLAW. SAW FILING MACHINE. rrmomxon runnoomm. 1906.

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PATENT OFFICE.

THOMAS CLINGMAN HOLSOLAW,

OF ETOWAH, NORTH CAROLINA.

SAW-FILIN G MACHINE.

- Specification of Letters Patent.

Patented July 16, 1907.

Application filed October 12,1906. Serial No. 338,626.

in Saw-Filing Machines, of which the following is a specification,reference being had therein to the acconr panying drawing.

Thisinvention relates to improvements in saw filing machines andconsists in the novel construction, combination and arrangement of partshereinafter described and claimed.

-' The object of the invention is to provide a simple and practicalmachine of this character by means of which a saw may be rapidly andeffectively filed. Further objects and advantages of the invention,

' as well as the structural features by means of which the y areattained, will be made clear by an examination of the followingspecification, taken in connection with the accompanying drawings, inwhich,

Figure, 1 is a view in elevation of my improved saw filing machine; Fig.2 is a top plan view of the same; Fig-. 3 is a vertical transversesectional view; Fig. 4 is a detail plan view, on an enlarged scale, ofthe filing frame and its attached parts; Fig. 5 is a transversesectional view taken on the plane indicated by the line 5-5. in Fig.4;,and Fig. 6 is a detail view of the rack and pinion bymeans of whichthe file is adjusted longitudinally of the saw clamp.

My improved saw filer comprises a clamp 1 including duplicate clampingplates 2, of the desired length and width, the proximate faces of whichare covered with a gripping and deadening strip 3, such as rubber or thelike. The plates are held in clamping relation through the medium ofcoil springs 4 arranged beneath the plates near each end, the terminalsof the springs being seated in the plates, and the springs so adjustedas to normally hold the plates in close contact. Near each endthe,plates are provided with series of vertically arranged holes or openings5 to receive suitable pins adapted in use to project transverse thespace between the plates and provide an adjustable rest for supportingthe teeth of the saw in proper position above the upper edges of theclamping plates. In Fig. 1, a bolt 6 is shown in the clamping plates tocooperate with the springs to hold the saw more effectively between saidplates. The bolt 6 has a loose engagement with the front clamping plateand a threaded engagement with the back clamping plate, so that when itis screwed inwardly thetwo plates will be clamped upon the saw.

In Figs. 2 and 3, I show a screw clamp 7 upon one of the plates forsecuring the device upon a work bench or the like, but any othersuitable means may be employed for this purpose.

The outerfaces of the clamping plates, near their upper edges, areformed with longitudinally-arranged recesses or grooves 8, the lowerwalls of which are preferably undercut, as shown in Fig. 3. Slide-bars 9are v arranged for longitudinal movement in these grooves, said barsbeing preferably provided on their upper edges with rollers 10 to bearagainst the upper walls of the grooves and reduce friction incident tothe movement of the bars. is provided with a bearing sleeve 11 in whichare fixedly supported front and rear frames 12, 13, each preferablyU-shaped with their terminal edges engaging the similarly arrangedsleeve of each of the bars. The I supporting frames 12, 13 connect thetwo slide bars and are in turn connected by a lever 14. The latter andthe frames 12, 13 thus form a sliding carrier or carriage for the sawfiling-device presently explained. .The said carrier is adapted to beadjusted longitudinally of the saw between the clamping plates 2 by rackand pinion devices .15. One of these devices is clearly shown in Fig. 6,and it consists of a pinion 16 fixed upon a shaft 17 which is mountedfor rotation in a substantially U-shaped bracket 18 and hasalinger-piece upon its outer end. The bracket 18 is secured upon thefront clamping plate 2 so that the pinion will mesh with rack teeth 19formed in the lower face of a projecting portion of the slide-bar 9 insaid front plate. Two of the devices 15 are preferably employed, onebeing arranged adjacent to each end of the saw clamp so that at leastone of the pinions 16 will mesh with the rack at all times. Set screws20 may be provided at suitable points in the bars 9 to clamp the carrierin an adjusted position. Said set screws pass through threaded openingsin the bars and have their inner ends impinging against the inner orbottom walls of the grooves 8. The lever 14 is arranged directly abovethe meeting edges of the plates 2 and is made adjustable vertically bypivoting one of its ends at 21 in the forward supporting frame 12 and byforming adjacent to its opposite end an apertured enlargement 22 throughwhich pro jects a screw-threaded stud 23. The latter is disposedcentrally and vertically upon the top of the rear supporting frame 13,and the rear or handle end of the lever 14 is adjusted upon it by nuts24, 25 arranged for threaded engagement with said stud above and belowthe lever. I

Intermediate the ends of the lever 14 upon its upper face is arranged acircular enlargement 26 formed with an aperture to receive a screw andnut 27 which also passes through an aperture formed in the fiat centralportion 28 of a semi-circular bar or red 29. The latter is adapted tosuspend above the saw, a filing frame 30 which is of open rectangularform and has at its ends apertures to receive the depending ends 31 ofthe semicircular rod or bar. Said ends 31 are screw-threaded andarranged upon them above and below the filing frame 30 are adjustingnuts 32. Cooperating with the set screw 27 in holding the frame at theproper angle Near the opposite ends, each bar relative to the saw is arod or link 33 arranged between passing through the slot in the rod 33,as clearly shown in Figs. 2 and 3 of the drawings. In adjusting thefiling frame an gularly, the last-mentioned nut 32 is loosened, as wellas the nut 27, and when these two'pa'rts are tightened, the link or rod33 and the filing frame will be rigidly connected together and thefiling frame will be held at the desired angle.

The filing frame 30 has formed in its longitudinal or side-bars 36guide-ways 37 which extend practically the entire length of the openingin the frame 30 and are adapted to slidably receive the lugs 38 formedon the ends of transverse brackets 39 in which latter is mounted one ormore files 40. But one file is shown in the drawings, and it is of theusual triangular shape. The brackets 39 are shaped to snugly receive theends of the file, as seen in Fig. 5, and clamping plates 41 are providedon the brackets for securely holding the file therein. By reason .ofthis construction, the file is mounted for longitudinal movement in theframe and this movement is imparted to it by providing its forwardbracket 39 with an extension 42 to which is secured a crank 43 havingbearings in the side-bars 36 of the frame 30 and provided beyond one ofsaid side-bars with a crank handle 43, in the operation of which thefile may be rapidly reciprocated longitudinally of the frame, as will beobvious.

Experience has demonstrated that saws cut better when sharpened byfiling in but one direction, and it is therefore desirable that means beprovided for causing efiective cutting of the file of the presentinvention when moving in but one direction only. This result I attain byproviding a lever 44 which is mounted upon a pivot 45 formed upon abracket 46 which is secured to the front slide bar 9, as clearly shownin Fig. 3. Said lever 44 has at one end an upwardly bent portion 47which directly underlies the lever 14 but is normally just out ofcontact therewith. The outer or forward end of the lever 44 extendsbeneath the crank 43 in position to be contacted with by a semi-circularblock or cam 48 adjustably secured upon said crank. In opera tion, themovement of the crank for one-half of its revolution causes the cam 48to bear upon the outer end of the lever 44 with the effect to elevatethe end 47, and thereby elevate the lever 12. This movement of the lever12 will raise the file out of cutting contact with the saw during itsmovement in one direction, so that the filing effect is gained bymovement of the file in one direction only.

In order to provide a positive gaging means for the cutting portion ofthe file or files of the filing frame, I arrange a plurality of seriesof gaging lines 49 on the outer faces of one or both clamp plates 2,each of said series of lines being respectively arranged to indicate theproper distance apart of the teeth of different gage saws. In operation,the file or files of the filing frame are adjusted with respect to thedesired series of lines,

thereby insuring an exact relative spacing of the teeth when filed, andproducing a perfectly spaced saw without regard to its condition wheninitially placed in the clamp.

In order to permit of the use of the machine as a saw set, I journal ina slotted portion 50 of the lever 14 a saw setting wheel'5l. Theconstruction and operation of this wheel is clearly set forth in aco-pending application filed by me December 9th, 1905, and bearingSerial Number 291,086. This Wheel is preferably removed when the machineis used for filing the saw.

In operation, the saw is securely clamped between the plates 2 so thatits teeth project slightly above the upper edges of saidplates and arein parallel relation therewith. The filing frame 30 is then adjusted atthe proper angle by the rod 33 and the set screw 27, and at the properelevation by adjusting the nut 25 upoh the screw stud 23. The nut 24,limiting the upward move: ment of the lever, is then adjusted asufficient distance above said lever. One of the knobs or finger-piecesof the rack and pinion devices 15 is then turned to move the filelongitudinally of the saw and permit it to aline.

with one of the gage lines 49. The crank handle 43 is then turned toreciprocate the file, causing the latter to cut the tooth to the desiredshape. After one tooth has been cut the handle 43 is turned to aposition in which the cam 48 depresses the lever 44 to cause the end 47of the latter to elevate the filing frame 30, and one of the devices 15is then operated to aline the file with the next succeeding gage line,and the file is again operated. It will thus be seen that the machinewill file the teeth uniformly in a quick and efficient manner, and thatan unskilled person may readily operate it. 7

Having thus described my said invention, what I claim as new and desireto secure by Letters Patent of the United States, is

1. A saw filing machine comprising a clamp, a carriage slidable on theclamp, a support upon said carriage, an inverted, U-shaped, suspendingframe pivoted upon the support and having one of its ends'screwthreaded, a filing frame upon the depending ends .of said II-shapedsuspending frame, a link pivoted at one of its ends upon the carriageand having its other end slotted to receive the threaded end of saidsuspending frame, and a nut upon the threaded end of said suspendingframe for clamping the slotted portion of said rod upon said filingframe.

2. A saw filing machine comprising a clamp, a carriage slidable on theclamp, a support upon said carriage an inverted, U-shaped, suspendingframe pivoted upon the support and having its depending ends screwthreaded, a filing frame apertured to receive the threaded ends of saidsuspending frame, nuts upon the threaded ends of said suspending frameabove and below said filing frame, and a file in said filing frame,substantially as described.

3. A saw filing machine comprising a saw clamp, a carriage slidable onthe clamp, a filing frame upon the carriage, said frame having side barsformed in their opposing edges with the longitudinally extending grooves37, cross bars arranged between said side bars and having their endsreduced to form the tongues 38 which enter and slide in said grooves 37,said cross bars being formed with depressions or seats, a file havingits ends engaged with said depressions or seats in the cross bars, theclamping plates 41 secured upon said cross bars for retaining the filein said depressions or seats, and means attached toone of said crossbars for reciprocating the latter and the file between them,substantially as described.

4. A saw filing machine comprising a saw clamp, a car riage slidable onthe clamp uprights upon said carriage, a file carrying frame, a supportfor said frame mounted upon said uprights and arranged longitudinallyabove and movable vertically toward and from the saw in the clamp, acrank shaft, a cam upon the latter, and a lever pivoted intermediate itsends upon the carriage and having one of its ends actuated by said camand its other end adapted for engagement with said support, for thepurpose specifled.

5. A saw filing machine comprising a saw clamp, a carriage slidable onthe clamp supports upon the carriage, a member upon said supports andmovable toward and from the saw in the clamp, a suspending frame uponthe movable member, a filing frame upon said suspending frame, a file insaid filing frame, a crank shaft mounted on said filing frame foroperating said file, a cam upon said crank shaft, and a lever pivotedintermediate its ends upon the carriage and having one of its endsactuated by said cam and its other end adapted for engagement with themovable member, substantially as shown and for the purpose set forth.

6. A saw filing machine comprising a saw clamp a carriage slidable onthe clamp, a bracket upon said carriage having a pivot stud at its upperend, an upright support upon the carriage, a longitudinally extendinglever pivoted to said support and adapted to swing vertically toward andfrom the saw in the clamp, a suspending frame upon said lever, a filingframe upon said suspending frame, a file in said filing frame, a crankshaft mounted on said filing frame for reciprocating said lilo, a leverloosely pivoted intermediate its ends upon the pivot stud of saidbracket and having one of its ends bent to engage said longitudinallyextending lever, and a cam upon said crank shaft for engagement with theother end of said lever, substantially as shown and for the purpose setforth.

7. A saw filing machine comprising a saw clamp, longitudinal barsslidable in grooves in the clamp, Ushaped frames upon said bars, a leverpivoted upon one of said frames, a screw stud upon the other of saidframes and projecting: through an aperture in said lever, nuts upon saidstud above and below said lever, and a saw tiling device carried by saidlever, substantially as described.

In testimony whereof I hereunto allix my signature in presence of twowitnesses.

THOMAS CLINGMAN HOLSCLAW.

Witnesses A. F. Jenni-m, E. E. Lnwls.

